[mmasse]

Some reading on other posts might have answered the question about the pressure buil up on the case. When I disconnected the breather to the intake, I also blocked the second outlet on the filler neck, which means that the oil fumes are trapped and build pressure inside the tank. I will connect a catch can to that second ( smaller ) breather on the filler neck, tomorrow....and maybe try one more run, to see if it gets better...or worst!!!